Multi Carrier aggregation allows the use of additional frequency bands and enables mobile data traffic to be optimally distributed to each frequency band, preventing network overload. Upon detecting LTE user concentration in the 800MHz band, the system automatically moves data traffic to 1.8GHz to improve data rate.

SK Telecom had 2.4 million LTE subscribers and a total base of more than 26 million mobile subscribers as of the end of April, making SK Telecom the second largest LTE service provider in the world after Verizon Wireless. About 30 percent of South Koreans are expected to move to LTE within a few months.

SK Telecom began full-fledged commercialization on July 1, delivering twice the bandwidth as its competitors. A firmware update enables the Galaxy S3 LTE to be able to support the technology. Moreover, most of the smartphones to be released in the second half of 2012 will be built with the MC technology.

Starting with Seoul’s Gangnam area, SK Telecom plans to complete MC roll-out in Seoul and major areas in six metropolitan cities within the year-end. It will also cover massive underground spaces like Underground Shopping Mall at Gangnam Station and COEX. Then, service area will be expanded to 23 cities including the Seoul metropolitan area and other metropolitan cities.